Water made it possible for _li_f_e to _d_ev_e_l_op_.
First,_s_m_a_l_l _pl_a_nt_s_,_s_h_e_llf_i_sh_,_f_i_sh__
green plants, land animals---insects,
Next,_a_m_p_h_ib_ia_n_s ___________________
astronomer
In the past, there are 9 planets. However, scientists now think Pluto is too small to be called a planet.
4. The names of eight planets.
1) 水星 2) 金星 3) 地球 4) 火星 5) 木星 6) 土星 7) 天王星 8) 海王星
forests
3 insects (on land) 4 amphibians (on land and in water)
5 reptiles (on land) 6 dinosaurs (on land) 7 mammals (on land) small clever
animals with hands and feet 8 human
II. Pre-reading
Nearly everybody has this or that puzzles: How do human beings come into being? How does the earth come into being?
In China, there are two legends about these puzzles. Do you know the names?